Information about the title: This is what the current edition of the calculation methods offers. The parallel structure of student books 1 and 2 is optimal for mixed-age or heterogeneous learning groups. Identification of the requirement areas of the educational standards on the "I can do this!" pages. Suggestions and guidelines for math conferences on various topics. Specifically indicated: tasks with natural differentiation and various other differentiation options. A large range of exercises, including suggestions for station work (practicing from station to station) and with puzzle pages (from the puzzle box) that encourage children to think and experiment. Starting from the 1st grade: tasks for collecting, representing in various ways, and evaluating data, as well as frequency and probability. Regionally relevant topics. Various mini-projects. Many interdisciplinary connections.